//
//  NSString+IsEmpty.m
//  kangzhipifuyisheng
//
//  Created by 唐开江 on 15/7/17.
//  Copyright (c) 2015年 KangZhi. All rights reserved.
//

#import "NSString+IsEmpty.h"

@implementation NSString (IsEmpty)

+ (BOOL) isEmpty:(NSString *) str {
    
    if (!str) {
        return true;
    } else {
        //A character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085).
        NSCharacterSet *set = [NSCharacterSet whitespaceAndNewlineCharacterSet];
        
        //Returns a new string made by removing from both ends of the receiver characters contained in a given character set.
        NSString *trimedString = [str stringByTrimmingCharactersInSet:set];
        
        if ([trimedString length] == 0) {
            return true;
        } else {
            return false;
        }
    }
}

@end
